Part A
AD629ARZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 6804 個数
- Package
- SOIC-8
- Series
- リニアアンプ - 計装用、オペアンプ、バッファアンプ
Replacement verdict
Compatible functional replacement candidate
The AD629BRZ-R7 and AD629ARZ are functionally interchangeable high common-mode voltage difference amplifiers sharing the same pinout, supply range, and gain configuration; the BRZ-R7 grade offers tighter gain and offset specifications, making it a valid drop-in candidate where enhanced DC precision is required, while the ARZ grade remains suitable for less demanding accuracy budgets.
Package and Pinout
High match
Supply Voltage Range
High match
Gain and Offset Accuracy Grade
Validation required
Operating Temperature Range
High match
Parts at a glance
Part B
AD629BRZ-R7
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 7417 個数
- Package
- SOIC-8
- Series
- リニアアンプ - 計装用、オペアンプ、バッファアンプ
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | AD629BRZ-R7 | AD629ARZ | Why it matters |
|---|---|---|---|
| Grade / Temperature Range | B grade, -40°C to +85°C | A grade, -40°C to +85°C | The B grade is a higher-performance bin than the A grade, so electrical specifications differ even though the operating temperature range is the same. |
| Input Offset Voltage (max) | 1 mV | 2 mV | Lower offset voltage improves DC accuracy in high-side current sensing and difference-amplifier applications. |
| Input Offset Voltage Drift (max) | 10 µV/°C | 20 µV/°C | Lower drift maintains accuracy over temperature, which is critical for precision measurement circuits. |
| Gain Error (max) | 0.02% | 0.05% | Gain error directly affects the scaling accuracy of the measured differential signal. |
| Common-Mode Rejection Ratio (min) | 86 dB | 77 dB | Higher CMRR rejects high common-mode voltages, which is the primary function of this high-side current-sense amplifier. |
| Input Bias Current (max) | 25 nA | 50 nA | Lower bias current reduces errors when sensing through high-value or mismatched source impedances. |
| Supply Voltage Range | ±2.5 V to ±18 V | ±2.5 V to ±18 V | Both parts support the same dual-supply range, allowing identical power-rail design. |
| Gain | 1 V/V (fixed) | 1 V/V (fixed) | Both are unity-gain difference amplifiers, so the transfer function is identical. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Identical package ensures footprint and assembly compatibility for drop-in substitution. |
| Common-Mode Input Range | -270 V to +270 V (with ±15 V supplies) | -270 V to +270 V (with ±15 V supplies) | Both tolerate the same very high common-mode voltage, enabling use in high-voltage current-sense designs. |
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Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | AD629ARZ | AD629BRZ-R7 |
|---|---|---|
| Part Status | Active | Active |
| Amplifier Type | Differential | Differential |
| Number of Circuits | 1 | 1 |
| Slew Rate | 2.1V/µs | 2.1V/µs |
| -3 dB Bandwidth | 500 kHz | 500 kHz |
| Voltage - Input Offset | 200 µV | 100 µV |
| Supply Current | 900µA | 900µA |
| Current - Output / Channel | 25 mA | 25 mA |
| Voltage - Supply Span(Min) | 5 V | 5 V |
| Voltage - Supply Span(Max) | 36 V | 36 V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What are the main differences between the AD629BRZ-R7 and the AD629ARZ?
Both devices are AD629 high common-mode voltage difference amplifiers from Analog Devices in an 8-lead SOIC package. The primary difference is the grade: the AD629BRZ-R7 is the B-grade version with tighter guaranteed specifications, while the AD629ARZ is the A-grade version. The B-grade offers lower offset voltage, lower offset voltage drift, lower gain error, and higher common-mode rejection ratio (CMRR) than the A-grade. The "-R7" suffix on the AD629BRZ-R7 indicates tape-and-reel packaging, whereas the AD629ARZ is typically supplied in tube packaging.
What is the maximum common-mode input voltage range for these devices?
The AD629 family is designed to handle common-mode voltages up to ±270 V with a supply of ±15 V, while maintaining a fixed gain of 1. This high common-mode range is achieved through a resistor network that attenuates the input before amplification. Both the AD629BRZ-R7 and AD629ARZ share this ±270 V common-mode capability per the Analog Devices datasheet.
How do the offset voltage specifications compare between the A and B grades?
Per the Analog Devices AD629 datasheet, the AD629BRZ (B-grade) has a maximum input offset voltage of 1 mV, while the AD629ARZ (A-grade) has a maximum input offset voltage of 2 mV. The B-grade also specifies tighter offset voltage drift over temperature, making it preferable for precision applications requiring low DC error.
Do the AD629BRZ-R7 and AD629ARZ have the same pinout and package?
Yes. Both the AD629BRZ-R7 and AD629ARZ are offered in the same 8-lead SOIC (R-8) package with an identical pinout. Pin functions include the inverting and non-inverting inputs, reference, output, and supply pins. Because the package and pinout are identical, the two grades are footprint-compatible on the same PCB land pattern.
Can the AD629ARZ be used as a drop-in replacement for the AD629BRZ-R7?
Because both parts share the same package, pinout, and gain of 1 configuration, the AD629ARZ is functionally interchangeable with the AD629BRZ-R7 on the same board. However, the A-grade has looser guaranteed limits for offset voltage, offset drift, gain error, and CMRR. A designer must verify that the relaxed A-grade specifications still meet the accuracy requirements of the target application before substituting.
What is the gain of these difference amplifiers and how is it set?
Both the AD629BRZ-R7 and AD629ARZ provide a fixed gain of 1 V/V. The gain is set internally by a precision laser-trimmed resistor network, so no external gain-setting resistors are required. This fixed gain of 1 simplifies design and preserves the high common-mode input range of ±270 V.
What supply voltage do the AD629BRZ-R7 and AD629ARZ require?
The AD629 family operates from dual supplies. Per the Analog Devices datasheet, the specified supply range is ±5 V to ±18 V, with ±15 V being the typical operating condition for the published specifications. Both the B-grade and A-grade versions share the same supply requirements.
How does the CMRR differ between the AD629BRZ-R7 and the AD629ARZ?
The B-grade AD629BRZ-R7 specifies a higher minimum common-mode rejection ratio than the A-grade AD629ARZ. According to the Analog Devices datasheet, the AD629B guarantees a minimum CMRR of 86 dB (typical 96 dB), while the AD629A guarantees a minimum CMRR of 80 dB (typical 90 dB). Higher CMRR is important in applications where large common-mode voltages must be rejected to extract a small differential signal.